CA1218333A - Method of keeping hot an inoperative regenerator during repair in a coke-oven battery - Google Patents
Method of keeping hot an inoperative regenerator during repair in a coke-oven batteryInfo
- Publication number
- CA1218333A CA1218333A CA000407983A CA407983A CA1218333A CA 1218333 A CA1218333 A CA 1218333A CA 000407983 A CA000407983 A CA 000407983A CA 407983 A CA407983 A CA 407983A CA 1218333 A CA1218333 A CA 1218333A
- Authority
- CA
- Canada
- Prior art keywords
- regenerator
- inoperative
- repair
- waste gas
- during
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B29/00—Other details of coke ovens
- C10B29/06—Preventing or repairing leakages of the brickwork
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B17/00—Preheating of coke ovens
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Coke Industry (AREA)
Abstract
"A method of keeping hot an inoperative regenerator during repair in a coke-oven battery"
ABSTRACT OF THE DISCLOSURE
A regenerator in a coke-oven battery which is inoperative during a repair is kept hot in order to prevent the formation of cracks in its structure due to thermal contraction. This is achieved in a simple, effective and cheap way by supplying hot waste gas to the inoperative regenerator from a location upstream (in the waste gas flow direction) of the checker work of one or more operating regenerators through added by-pass conduits during the repair.
The temperature of the regenerator can be monitored and controlled by adjustment of the waste gas supply.
ABSTRACT OF THE DISCLOSURE
A regenerator in a coke-oven battery which is inoperative during a repair is kept hot in order to prevent the formation of cracks in its structure due to thermal contraction. This is achieved in a simple, effective and cheap way by supplying hot waste gas to the inoperative regenerator from a location upstream (in the waste gas flow direction) of the checker work of one or more operating regenerators through added by-pass conduits during the repair.
The temperature of the regenerator can be monitored and controlled by adjustment of the waste gas supply.
Description
33~
'iA method ~f keeping hot an inoperative regenerator during repair in a coke-oven battery"
BACKGROUN~ GF rrHE INVENTION
_ The invention relates to a method of keeping hot a regenerator of a coke-oven battery while the regenerator is out of operation during repair. Such a regenerator, which itself may or may not be the subject of the repair, is here referred to as "inoperative".
'iA method ~f keeping hot an inoperative regenerator during repair in a coke-oven battery"
BACKGROUN~ GF rrHE INVENTION
_ The invention relates to a method of keeping hot a regenerator of a coke-oven battery while the regenerator is out of operation during repair. Such a regenerator, which itself may or may not be the subject of the repair, is here referred to as "inoperative".
2. DESCRIPTION OF THE PRIOR ART
A horizontal coke-oven battery comprises a number of coking chambers separated by so-called combustion walls. Combustion chambers are arranged in eaeh combustion wall. Beneath the row of coking chambers and the combustion cha~bers, there are regenerators for pre-heating the combustion air fed to the combustion chambers. Each regenerator contains a heat-storage strueture, typically a structure known as the checker work, which stores and releases heat in order to effect heat exchange in the regenerator. The whole construction is of refractory material with a predominance of silica bricks, fireclay bricks possibly also being used in the less hot regions.
'i'i~
.333 ~ uring operation of the battery, gas (e.g.
coke-oven gas) is burned in the combustion charnbers.
The heat thereby liberated is conducted through the combustion chamber walls to the coking coal in the coking chambers to effect the c~oking. The waste (i.e. exhaust) gases released during combustion are led through one half of the plurality of regenerators, which are heated by the waste gases, and the waste gases are then discharged through a stack. At the same time air is led through the other regenerators, which air is heated and supplied as warm combustion air to the combustion chambers. The regenerators have a large thermal capacity because of the checker work.
After a period of e.g. half an hour the regenerators are reversed, air is conducted through the now warmed regenerators, and the cooled regenerators are heated by waste gases.
To conduct the waste gases and air, there is in the refractory construction a complicated system of connecting ducts in the spaces between the combustion chambers and the regenerators. Various systems are known for connecting the regenerators and combustion chambers, which it is not necessary to discuss here.
The invention will be discussed here for in relation to a particular system, namely the Coppée sys em, ~2~333
A horizontal coke-oven battery comprises a number of coking chambers separated by so-called combustion walls. Combustion chambers are arranged in eaeh combustion wall. Beneath the row of coking chambers and the combustion cha~bers, there are regenerators for pre-heating the combustion air fed to the combustion chambers. Each regenerator contains a heat-storage strueture, typically a structure known as the checker work, which stores and releases heat in order to effect heat exchange in the regenerator. The whole construction is of refractory material with a predominance of silica bricks, fireclay bricks possibly also being used in the less hot regions.
'i'i~
.333 ~ uring operation of the battery, gas (e.g.
coke-oven gas) is burned in the combustion charnbers.
The heat thereby liberated is conducted through the combustion chamber walls to the coking coal in the coking chambers to effect the c~oking. The waste (i.e. exhaust) gases released during combustion are led through one half of the plurality of regenerators, which are heated by the waste gases, and the waste gases are then discharged through a stack. At the same time air is led through the other regenerators, which air is heated and supplied as warm combustion air to the combustion chambers. The regenerators have a large thermal capacity because of the checker work.
After a period of e.g. half an hour the regenerators are reversed, air is conducted through the now warmed regenerators, and the cooled regenerators are heated by waste gases.
To conduct the waste gases and air, there is in the refractory construction a complicated system of connecting ducts in the spaces between the combustion chambers and the regenerators. Various systems are known for connecting the regenerators and combustion chambers, which it is not necessary to discuss here.
The invention will be discussed here for in relation to a particular system, namely the Coppée sys em, ~2~333
3 --in which alternate regenerators are coupled at any time to waste gas and air respectively. However, the invention also relates to other systems such as for instance the Still system. A regenerator is said to be "on air" when it passes air and "on gas" when passing the hot waste gas.
As has already been mentioned the refractory construction is largely built of silica brick. On being heated from room temperature to 400-600C, the silica material exhibits a very large expansion. On the other hand, its expansion in the operating temperature range is very small. A problem always arises when a regenerator of a coke-oven battery in operation cools below the temperature of 400C mentioned above and enters the high expansion range. Shrinkage cracks occur in the refractory construction which do not close up again when the regenerator is brought back up to operating temperature. Air from a regenerator on air can enter a regenerator on gas via these cracks. As a result, combustion in the combustion chambers suffers from a deficiency of air so that there is local occurrence of so-called "cold spots" at the coke side and/or the pusher side of the battery. As a result of incomplete combustion in the combustion chambers, after-combustion can occur in the regenerators, with consequent melting of the checker bricks.
,,, .. ~ . .... , . . . . , .,, . ~ ,, ~'Z~8~3~
I'he problem of an excessively cooled regenerator occurs above all when the regenerator as a whole is receiving no further waste gas, because the combu~tion chambers with which it is connected are out of operation.
Such a situation arises during the repair of two (or more) adjacent combustion walls, a so-called "two wall repair" although the present invention is also applicable in less radical repair situationO
DE-OLS 2 124 618 and 2 122 729 both of Heinrich Koppers GmbH describe a repair process for coke-oven batteries in which the inoperative regenerator is kept hot by the use of additional burners located above the checker work of the regenerator. This method is not satisfactory primarily because the heating effect is by radiation from the combustion at the burners which causes an uneven temperature distribution and consequently variations in thermal expansion in the regenerator walls. This leads to cracks in the walls. Other disadvantages are the cost of the fuel supplied to these burners and the danger of explosion.
SUMMARY OF THE INVENTION
The invention is intended to provide a method in which excessive cooling of an inoperative regenerator is avoided.
.. . . . . . . . . .. . ... .. . ...
ç~3 According to the invention the waste gas flow of one or more operating regenerators is conducted to the inoperative regenerator from a location upstream of the heat-storage structure of the operating regenerator(s).
The main advantage of this is that the regenerator can be held at a temperature which is so high that the occurrence of shrinkage cracks is prevented.
Another advantage is that, when the regenerator is brought back into operation it reaches the operating temperature more rapidly, so that the repaired region is not out of operation for so long and the loss of production is limited.
Preferably the hot waste gas is supplied to the inoperative regenerator through one or more by-pass lines arranged for the duration of the repair in at least one "meistergang" of the battery (also known as the bench gallery). The by-pass lines may then be connected to a regenerator by means of a passage in the front wall of the regenerator. This passage into the regenerator opens above the checkerwork in the regenerator.
In order to avoid loss of heat ~rom the inoperative regenerator in the period during which this regenerator, if it were operating, would be on air, the air inlet valve of the inoperative regenerator . . . .. .. .. .. . . . . .. . .. . . ... . . .... . . . . .. ..... ... ... . .. .... ..... . ..
?~,~
should be kept continuously closed during the inoperative period.
In order to avoid loss of heat from the in-operative regenerator in the period during which waste gas from one or more operating regenerators are conducted to the inoperative regenerator, as a result of unwanted cold air entering through the ducts connecting it with inoperative combustion chambers, these connecting ducts should be blocked during the inoperative period. Preferably these connecting ducts should be blocked at their openings in these combustion chambers.
In order to prevent the temperature of the inoperative regenerator from falling too low and the temperature of the operating regenerator(s) delivering hot waste gas from being too much affected, preferably the temperature of the inoperative regenerator is measured and is then regulated by displacement of a butterfly valve in the waste gas outlet of this regenerator and/or the butterfly valves of the operating regenerator(s) which are connected to it.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the invention will now be described by way of non-limitative e~ample with reference to the accompanying drawings, in which:-.. . . . . . ... .. . . . . .
3~
-- 7 ~
Fiy. 1 is a vertical longitudinal sectionthrough a plurality of coking chambers of a coke-oven battery.
Fig. 2 is a vertical transverse section through a combustion wall of the coke-oven battery of Fig.
1.
Fig. 3 is a schematic plan view of one part of the coke oven battery of Fig. 1.
Fig. 4 is a schematic plan view of the coke-oven battery showing the by-pass lines.
Fig. 5 is a vertical longitudinal section at the location of the regenerators of the coke-oven battery showing the by-pass lines.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As has already been mentioned, the invention is discussed here in relation to a coke-oven battery of the Coppée system.
Fig. 1 shows a coke-oven battery having coking chambers 1 and intervening combustion walls 2 in which combustion chambèrs 3 are arranged. Below the coking chambers there are regenerators 4, which are connected with the combustion chambers 3 by connecting ducts 5, and which are each connected at their bottom ends to a waste gas duct 10 via a reversible valve chest 6, which contains a waste gas valve 7 and waste gas outlet ~, the latter having a butterfly valve 9.
~2~
The waste gas duct 10 is connected to a flue which is not shown. An air inlet valve 12 is also arranged in the reversible valve chest 6. The regenerators
As has already been mentioned the refractory construction is largely built of silica brick. On being heated from room temperature to 400-600C, the silica material exhibits a very large expansion. On the other hand, its expansion in the operating temperature range is very small. A problem always arises when a regenerator of a coke-oven battery in operation cools below the temperature of 400C mentioned above and enters the high expansion range. Shrinkage cracks occur in the refractory construction which do not close up again when the regenerator is brought back up to operating temperature. Air from a regenerator on air can enter a regenerator on gas via these cracks. As a result, combustion in the combustion chambers suffers from a deficiency of air so that there is local occurrence of so-called "cold spots" at the coke side and/or the pusher side of the battery. As a result of incomplete combustion in the combustion chambers, after-combustion can occur in the regenerators, with consequent melting of the checker bricks.
,,, .. ~ . .... , . . . . , .,, . ~ ,, ~'Z~8~3~
I'he problem of an excessively cooled regenerator occurs above all when the regenerator as a whole is receiving no further waste gas, because the combu~tion chambers with which it is connected are out of operation.
Such a situation arises during the repair of two (or more) adjacent combustion walls, a so-called "two wall repair" although the present invention is also applicable in less radical repair situationO
DE-OLS 2 124 618 and 2 122 729 both of Heinrich Koppers GmbH describe a repair process for coke-oven batteries in which the inoperative regenerator is kept hot by the use of additional burners located above the checker work of the regenerator. This method is not satisfactory primarily because the heating effect is by radiation from the combustion at the burners which causes an uneven temperature distribution and consequently variations in thermal expansion in the regenerator walls. This leads to cracks in the walls. Other disadvantages are the cost of the fuel supplied to these burners and the danger of explosion.
SUMMARY OF THE INVENTION
The invention is intended to provide a method in which excessive cooling of an inoperative regenerator is avoided.
.. . . . . . . . . .. . ... .. . ...
ç~3 According to the invention the waste gas flow of one or more operating regenerators is conducted to the inoperative regenerator from a location upstream of the heat-storage structure of the operating regenerator(s).
The main advantage of this is that the regenerator can be held at a temperature which is so high that the occurrence of shrinkage cracks is prevented.
Another advantage is that, when the regenerator is brought back into operation it reaches the operating temperature more rapidly, so that the repaired region is not out of operation for so long and the loss of production is limited.
Preferably the hot waste gas is supplied to the inoperative regenerator through one or more by-pass lines arranged for the duration of the repair in at least one "meistergang" of the battery (also known as the bench gallery). The by-pass lines may then be connected to a regenerator by means of a passage in the front wall of the regenerator. This passage into the regenerator opens above the checkerwork in the regenerator.
In order to avoid loss of heat ~rom the inoperative regenerator in the period during which this regenerator, if it were operating, would be on air, the air inlet valve of the inoperative regenerator . . . .. .. .. .. . . . . .. . .. . . ... . . .... . . . . .. ..... ... ... . .. .... ..... . ..
?~,~
should be kept continuously closed during the inoperative period.
In order to avoid loss of heat from the in-operative regenerator in the period during which waste gas from one or more operating regenerators are conducted to the inoperative regenerator, as a result of unwanted cold air entering through the ducts connecting it with inoperative combustion chambers, these connecting ducts should be blocked during the inoperative period. Preferably these connecting ducts should be blocked at their openings in these combustion chambers.
In order to prevent the temperature of the inoperative regenerator from falling too low and the temperature of the operating regenerator(s) delivering hot waste gas from being too much affected, preferably the temperature of the inoperative regenerator is measured and is then regulated by displacement of a butterfly valve in the waste gas outlet of this regenerator and/or the butterfly valves of the operating regenerator(s) which are connected to it.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the invention will now be described by way of non-limitative e~ample with reference to the accompanying drawings, in which:-.. . . . . . ... .. . . . . .
3~
-- 7 ~
Fiy. 1 is a vertical longitudinal sectionthrough a plurality of coking chambers of a coke-oven battery.
Fig. 2 is a vertical transverse section through a combustion wall of the coke-oven battery of Fig.
1.
Fig. 3 is a schematic plan view of one part of the coke oven battery of Fig. 1.
Fig. 4 is a schematic plan view of the coke-oven battery showing the by-pass lines.
Fig. 5 is a vertical longitudinal section at the location of the regenerators of the coke-oven battery showing the by-pass lines.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As has already been mentioned, the invention is discussed here in relation to a coke-oven battery of the Coppée system.
Fig. 1 shows a coke-oven battery having coking chambers 1 and intervening combustion walls 2 in which combustion chambèrs 3 are arranged. Below the coking chambers there are regenerators 4, which are connected with the combustion chambers 3 by connecting ducts 5, and which are each connected at their bottom ends to a waste gas duct 10 via a reversible valve chest 6, which contains a waste gas valve 7 and waste gas outlet ~, the latter having a butterfly valve 9.
~2~
The waste gas duct 10 is connected to a flue which is not shown. An air inlet valve 12 is also arranged in the reversible valve chest 6. The regenerators
4 are filled with checker work 13. Gas supply ducts 15 also open in the floors 14 of the combustion chambers 3.
It may be seen from the vertical cross-section of Fig. 2 that in a combustion wall 2 there are a large number, for instance 24, combustion chambers 3 connected with resenerators via the connecting ducts 5. The combustion chambers 31 are connected to a regenerator on air via connecting ducts 51. These combustion chambers are in connection with neighbouring combustion chambers 32 via ports 16. The waste gas generated by eombustion in the combustion ehambers 31 and 32 is discharged via eonneeting duets 52 to the regenerator on gas 4 and is further diseharged via a eolleeti.ng duet 17 via the reversible valve ehest and the waste-gas duet to the staek (not shown in the figure).
Fig. 3.shows the arrangement of several combustion ehambers and regenerators in a sehematie top view of a eoke-oven battery. The regenerators loeated below two adjaeent eoking ehambers are indicated by the reference numbers 718 and 719. The combust.ion walls between the coking chambers are indieated by , .. , ., ~, .
~ ? ~ 3 g _ references 717/718, 718/719 and 719/720. Each combustion wall has a plurality of combustion chambers 3, which each have a gas supply duct 15 and connecting ducts
It may be seen from the vertical cross-section of Fig. 2 that in a combustion wall 2 there are a large number, for instance 24, combustion chambers 3 connected with resenerators via the connecting ducts 5. The combustion chambers 31 are connected to a regenerator on air via connecting ducts 51. These combustion chambers are in connection with neighbouring combustion chambers 32 via ports 16. The waste gas generated by eombustion in the combustion ehambers 31 and 32 is discharged via eonneeting duets 52 to the regenerator on gas 4 and is further diseharged via a eolleeti.ng duet 17 via the reversible valve ehest and the waste-gas duet to the staek (not shown in the figure).
Fig. 3.shows the arrangement of several combustion ehambers and regenerators in a sehematie top view of a eoke-oven battery. The regenerators loeated below two adjaeent eoking ehambers are indicated by the reference numbers 718 and 719. The combust.ion walls between the coking chambers are indieated by , .. , ., ~, .
~ ? ~ 3 g _ references 717/718, 718/719 and 719/720. Each combustion wall has a plurality of combustion chambers 3, which each have a gas supply duct 15 and connecting ducts
5 to the regenerators. Fig. 3 shows for example the situation in which regenerator 718 is on air, that is to say it is delivering heated combustion air to the combustion chambers in the combustion walls 717/718 znd 718/719. At the same time regenerator 719 is on gas, i.e. receives waste gas from the combustion walls 718/719 and 719/720. This is the normal mode of operation.
The danger of shrinkage cracks in the regenerators is especially prominent when both the combustion walls 718/719 and 719/720 are not operating. Then regenerator 719 as a whole is no longer receiving waste gas. This situation occurs with the repair of these two (or more) combustion walls. The regenerator 718 is no longer receiving waste gas from wall 718/719 but only has to deliver air to wall 717/718. The temperature of this regenerator is however affected by heat leakage to the cold regenerator 719 and as a result the regenerator 718 cools.
In Figs. 4 and 5 illustrate for this embodiment the measures to be taken (with regenerator 719 inoperative) according to the invention in the above situation.
The waste gas of other operating regenerators is supplied to regenerator 719. It is preferred that this waste gas is not provided by the adjacent regenerators 718 and 720, since these are, as already discussed, at half power and i.n addition are losing heat already because of heat leakage to regenerator 719. In addition the waste gas valves of regenerators 718 and 720 are operated in counter~phase with those of regenerator 719. Similarly, there is the possibility of supply of waste gas from regenerators 717 and/or 721. However these regenerators are subject to heat leakage to the regenerators 718 and 720. Although the quantity of heat to be supplied to the inoperative regenerator 719, in order to compensate for the heat leakage from it to the exterior, is not large in comparison with the heat exchanged in an operating regenerator, this may cause a disturbance which acts adversely on coke production. Fig. 4 shows that the hot waste gas is in this embodiment supplied from the regenerators 715 and 723 which are relatively far from the inoperative regenerator 719.
Although the hot waste gas can be supplied by one operating regenerator, there is the preferred possibility since a regenerator is usually divided by an intermediate wall 18 into two compartments 19 of supplying the hot waste gas to each compartment . .. . .. . . . .. . .. .. .. .. ~ .. . . .
q~3 from one operating regenerator. Waste gas can also be supplied to one compartment from several operating regenerators, if the action of one operating regenerator would be adversely affected by the loss of hot waste gas to an inoperative regenerator compartment.
- The hot waste gas is supplied via by-pass lines 20, which are arranged in a space 21 known to the industry as the l'melstergangll or llbench gallery"
(see also Fig. 2). The by-pass lines can be mounted in the bench gallery on the pusher side or in the bench gallery on the coke side of the coke ovens, or in both.
'The hot waste gas is supplied via the by-pass lines 20 whicn are connected to a regenerator compartment 715, 719 and 723 by means of an aperture 22 in the so~called front wall 23 of each regenerator, with the aperture in the regenerator compartment in each case opening above the checker work 13 (see also Fig. 2).
The advantage of this is that the hot waste gas is supplied to the inoperative regenerator in a duct bounded by the vault 24 of the regenerator and the checker work, so that the heat penetrates deep into the compartment and is distributed evenly over the compartment.
FigO 2 thus shows that the hot waste gas supplied to the operating regenerators is partly diverted to the inoperative regenerator from a location upstream of the checkerwork of the operating regenerators.
When regenerators 715 719 and 723 are gas, that is to say the waste gas valves 7 are open, the waste gas i~ drawn through the by-pass lines 20 -to the inoperative regenerator 719 by the gas outlet flue draught. At the same time, however, cold air may be led via the connecting ducts 5 of the combustion chambers in the inoperative combustion walls 718/719 and 719/720 to the regenerator 719, thus hindering the maintenance of the regenerator at temperature. To prevent this, connecting ducts of the inoperative combustion chambers are therefore kept closed during the repair; particularly the ports 25 (see Fig.l) at ~hich the connecting ducts open into the floor 14 of the combustion chambers are blocked.
When the regenerators 715,719 and 723 are on air, i.e. the waste gas valves 7 are closed and the air inlet valves 12 are open, air may be brought via the by-pass lines 20 from regenerator 719 to regen-erators 715 and 723. This not only affects the action of regenerators 715 and 723, but also partly neutralizes the effect of the hot waste gas brought to regenerator ~2~3;~3 719. Therefore to prevent this the air inlet valves of the inoperative regenerator are kept continuously closed during the repair.
In this embodiment of the method of 'he invention, the temperature of the inoperative regenerator is monitored by measuring the temperature of the regenerator for instance by means of thermocouples in the regenerator, and optionally by measuring the temperature of the waste gas in the reversible valve chest 6 and taking this as a measure of the regenerator temperature.
From this data relating to the temperature of the regenerator, this temperatùre is then controlled by adjustment of the butterfly valves 9 in the waste gas outlets of the inoperative regenerator 719 and the operating waste gas supply regenerators 715 and 723.
The danger of shrinkage cracks in the regenerators is especially prominent when both the combustion walls 718/719 and 719/720 are not operating. Then regenerator 719 as a whole is no longer receiving waste gas. This situation occurs with the repair of these two (or more) combustion walls. The regenerator 718 is no longer receiving waste gas from wall 718/719 but only has to deliver air to wall 717/718. The temperature of this regenerator is however affected by heat leakage to the cold regenerator 719 and as a result the regenerator 718 cools.
In Figs. 4 and 5 illustrate for this embodiment the measures to be taken (with regenerator 719 inoperative) according to the invention in the above situation.
The waste gas of other operating regenerators is supplied to regenerator 719. It is preferred that this waste gas is not provided by the adjacent regenerators 718 and 720, since these are, as already discussed, at half power and i.n addition are losing heat already because of heat leakage to regenerator 719. In addition the waste gas valves of regenerators 718 and 720 are operated in counter~phase with those of regenerator 719. Similarly, there is the possibility of supply of waste gas from regenerators 717 and/or 721. However these regenerators are subject to heat leakage to the regenerators 718 and 720. Although the quantity of heat to be supplied to the inoperative regenerator 719, in order to compensate for the heat leakage from it to the exterior, is not large in comparison with the heat exchanged in an operating regenerator, this may cause a disturbance which acts adversely on coke production. Fig. 4 shows that the hot waste gas is in this embodiment supplied from the regenerators 715 and 723 which are relatively far from the inoperative regenerator 719.
Although the hot waste gas can be supplied by one operating regenerator, there is the preferred possibility since a regenerator is usually divided by an intermediate wall 18 into two compartments 19 of supplying the hot waste gas to each compartment . .. . .. . . . .. . .. .. .. .. ~ .. . . .
q~3 from one operating regenerator. Waste gas can also be supplied to one compartment from several operating regenerators, if the action of one operating regenerator would be adversely affected by the loss of hot waste gas to an inoperative regenerator compartment.
- The hot waste gas is supplied via by-pass lines 20, which are arranged in a space 21 known to the industry as the l'melstergangll or llbench gallery"
(see also Fig. 2). The by-pass lines can be mounted in the bench gallery on the pusher side or in the bench gallery on the coke side of the coke ovens, or in both.
'The hot waste gas is supplied via the by-pass lines 20 whicn are connected to a regenerator compartment 715, 719 and 723 by means of an aperture 22 in the so~called front wall 23 of each regenerator, with the aperture in the regenerator compartment in each case opening above the checker work 13 (see also Fig. 2).
The advantage of this is that the hot waste gas is supplied to the inoperative regenerator in a duct bounded by the vault 24 of the regenerator and the checker work, so that the heat penetrates deep into the compartment and is distributed evenly over the compartment.
FigO 2 thus shows that the hot waste gas supplied to the operating regenerators is partly diverted to the inoperative regenerator from a location upstream of the checkerwork of the operating regenerators.
When regenerators 715 719 and 723 are gas, that is to say the waste gas valves 7 are open, the waste gas i~ drawn through the by-pass lines 20 -to the inoperative regenerator 719 by the gas outlet flue draught. At the same time, however, cold air may be led via the connecting ducts 5 of the combustion chambers in the inoperative combustion walls 718/719 and 719/720 to the regenerator 719, thus hindering the maintenance of the regenerator at temperature. To prevent this, connecting ducts of the inoperative combustion chambers are therefore kept closed during the repair; particularly the ports 25 (see Fig.l) at ~hich the connecting ducts open into the floor 14 of the combustion chambers are blocked.
When the regenerators 715,719 and 723 are on air, i.e. the waste gas valves 7 are closed and the air inlet valves 12 are open, air may be brought via the by-pass lines 20 from regenerator 719 to regen-erators 715 and 723. This not only affects the action of regenerators 715 and 723, but also partly neutralizes the effect of the hot waste gas brought to regenerator ~2~3;~3 719. Therefore to prevent this the air inlet valves of the inoperative regenerator are kept continuously closed during the repair.
In this embodiment of the method of 'he invention, the temperature of the inoperative regenerator is monitored by measuring the temperature of the regenerator for instance by means of thermocouples in the regenerator, and optionally by measuring the temperature of the waste gas in the reversible valve chest 6 and taking this as a measure of the regenerator temperature.
From this data relating to the temperature of the regenerator, this temperatùre is then controlled by adjustment of the butterfly valves 9 in the waste gas outlets of the inoperative regenerator 719 and the operating waste gas supply regenerators 715 and 723.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a method of keeping hot a regenerator in a coke-oven battery, which regenerator is inoperative during a repair, the improvement that, during the repair, hot waste gas is diverted from at least one operating regenerator of the battery to the inoperative regenerator, the diversion of the hot waste gas taking place up-stream (in the flow direction of the hot waste gas) of the heat storage structure of said operating regenerator(s).
2. A method according to claim 1 wherein the said hot waste gas is supplied to the inoperative regenerator via at least one by-pass conduit which is installed for the duration of the repair in at least one bench gallery of the battery.
3. A method according to claim 2 wherein said inoperative regenerator has an end wall adjacent said bench gallery, said by-pass conduit being connected into the inoperative regenerator via an aperture located in said end wall at a height such that the waste gas enters above the heat-storage structure of said inop-erative regenerator.
4. A method according to any one of claims 1 to 3 wherein the inoperative regenerator has an air inlet valve which is kept closed throughout the repair.
5. A method according to claim 1 wherein the battery has a plurality of combustion chambers associated with said inoperative regenerator, which chambers are also inoperative during the repair, there being ducts connecting the regenerator to said combusion chambers which ducts are kept closed during the repair.
6. A method according to any one of claims 1 to 3 wherein the battery has a plurality of combustion chambers associated with said inoperative regenerator, which chambers are also inoperative during the repair, there being ducts connecting the regenerator to said combustion chambers which ducts are kept closed during the repair by blocking them at the locations where they open in the combustion chambers.
7. A method according to any one of claims 1 to 3 wherein the inoperative regenerator and the said operating regenerator(s) have waste gas outlets in which butterfly valves are located, and the temperature of the inoperative regenerator is measured during the repairs, and is controlled in dependence on the measurement by adjustment of the said butterfly valve in its waste gas outlet and/or by adjustment of the butterfly valve in the waste gas outlet of the or each said operating regenerator.
8. A method of repair of a coke-oven battery wherein at least one regenerator, which is inoperative during the repair, is kept hot by a method according to any one of claims 1 to 3.
9. A method of effecting a repair in a coke-oven battery having a plurality of coking chambers, a plurality of gas combustion chambers for heating said coking chambers and a plurality of regenerators for preheating combustion air supplied to said combustion chambers said regenerators each containing a heat storage structure, the method comprising the steps of a) taking out of service at least one. said regenerator, b) effecting said repair, and c) during said repair, supplying hot waste gas from operating combustion chambers to said out-of-service regenerator in order to maintain it at a desired temperature, which hot waste gas is diverted to said out-of-service regenerator from a location upstream (in the waste gas flow direction) of the said heat storage structure of at least one operating regenerator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8103645A NL8103645A (en) | 1981-08-03 | 1981-08-03 | Coke oven battery regenerator out of action during repair - is connected to other hot run regenerators to prevent excessive cooling |
| NL8103645 | 1981-08-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1218333A true CA1218333A (en) | 1987-02-24 |
Family
ID=19837884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000407983A Expired CA1218333A (en) | 1981-08-03 | 1982-07-23 | Method of keeping hot an inoperative regenerator during repair in a coke-oven battery |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1218333A (en) |
| NL (1) | NL8103645A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500296A (en) * | 2020-05-06 | 2020-08-07 | 合肥汇乐谷化工技术开发有限公司 | Coke oven for producing formed coke by anthracite |
-
1981
- 1981-08-03 NL NL8103645A patent/NL8103645A/en not_active Application Discontinuation
-
1982
- 1982-07-23 CA CA000407983A patent/CA1218333A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500296A (en) * | 2020-05-06 | 2020-08-07 | 合肥汇乐谷化工技术开发有限公司 | Coke oven for producing formed coke by anthracite |
Also Published As
| Publication number | Publication date |
|---|---|
| NL8103645A (en) | 1983-03-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |